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Issue 38, 2019
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Core–shell anatase anode materials for sodium-ion batteries: the impact of oxygen vacancies and nitrogen-doped carbon coating

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Abstract

In this work, the impact of oxygen vacancies and nitrogen-doped carbon coating on the sodium-ion storage properties of anatase TiO2 has been demonstrated. Oxygen vacancies and nitrogen-doped carbon coating were introduced simultaneously by the calcination of core–shell structured TiO2 spheres in a reducing atmosphere. Compared to the anatase TiO2 with and without oxygen vacancies, TiO2−x@NC exhibits much better electrochemical performance in the storage of sodium ions. A high reversible capacity of 245.6 mA h g−1 is maintained at 0.1 A g−1 after 200 cycles, and a high specific capacity of 155.6 mA h g−1 is achieved at a high rate of 5.0 A g−1. The significantly improved electrochemical performance of the core–shell structured anatase TiO2 spheres is attributed to the synergistic effect of the oxygen vacancies in the anatase lattice and surface nitrogen-doped carbon coating. This work provides an efficient strategy for improving the electrochemical performance of metal–oxide-based electrode materials for sodium-ion batteries.

Graphical abstract: Core–shell anatase anode materials for sodium-ion batteries: the impact of oxygen vacancies and nitrogen-doped carbon coating

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Article information


Submitted
23 Jul 2019
Accepted
03 Sep 2019
First published
03 Sep 2019

Nanoscale, 2019,11, 17860-17868
Article type
Paper

Core–shell anatase anode materials for sodium-ion batteries: the impact of oxygen vacancies and nitrogen-doped carbon coating

Y. Bai, R. Xarapatgvl, X. Wu, X. Liu, Y. Liu, K. Wang and J. Chen, Nanoscale, 2019, 11, 17860
DOI: 10.1039/C9NR06245A

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